The Tor Browser: dom/smil/SMILIntegerType.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "SMILIntegerType.h"

     7 #include "nsSMILValue.h"

     8 #include "nsDebug.h"

     9 #include <math.h>

    11 namespace mozilla {

    13 void

    14 SMILIntegerType::Init(nsSMILValue& aValue) const

    15 {

    16   NS_ABORT_IF_FALSE(aValue.IsNull(), "Unexpected value type");

    17   aValue.mU.mInt = 0;

    18   aValue.mType = this;

    19 }

    21 void

    22 SMILIntegerType::Destroy(nsSMILValue& aValue) const

    23 {

    24   NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");

    25   aValue.mU.mInt = 0;

    26   aValue.mType = nsSMILNullType::Singleton();

    27 }

    29 nsresult

    30 SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const

    31 {

    32   NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");

    33   NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");

    34   aDest.mU.mInt = aSrc.mU.mInt;

    35   return NS_OK;

    36 }

    38 bool

    39 SMILIntegerType::IsEqual(const nsSMILValue& aLeft,

    40                          const nsSMILValue& aRight) const

    41 {

    42   NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");

    43   NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");

    45   return aLeft.mU.mInt == aRight.mU.mInt;

    46 }

    48 nsresult

    49 SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,

    50                      uint32_t aCount) const

    51 {

    52   NS_PRECONDITION(aValueToAdd.mType == aDest.mType,

    53                   "Trying to add invalid types");

    54   NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");

    55   aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;

    56   return NS_OK;

    57 }

    59 nsresult

    60 SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,

    61                                  const nsSMILValue& aTo,

    62                                  double& aDistance) const

    63 {

    64   NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");

    65   NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");

    66   aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));

    67   return NS_OK;

    68 }

    70 nsresult

    71 SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,

    72                              const nsSMILValue& aEndVal,

    73                              double aUnitDistance,

    74                              nsSMILValue& aResult) const

    75 {

    76   NS_PRECONDITION(aStartVal.mType == aEndVal.mType,

    77                   "Trying to interpolate different types");

    78   NS_PRECONDITION(aStartVal.mType == this,

    79                   "Unexpected types for interpolation");

    80   NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");

    82   const double startVal   = double(aStartVal.mU.mInt);

    83   const double endVal     = double(aEndVal.mU.mInt);

    84   const double currentVal = startVal + (endVal - startVal) * aUnitDistance;

    86   // When currentVal is exactly midway between its two nearest integers, we

    87   // jump to the "next" integer to provide simple, easy to remember and

    88   // consistent behaviour (from the SMIL author's point of view).

    90   if (startVal < endVal) {

    91     aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up

    92   } else {

    93     aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down

    94   }

    96   return NS_OK;

    97 }

    99 } // namespace mozilla

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